C) secondary phloem
D) all of these
Correct Answer: D
Solution :Dicot stem produces a cork cambium or phellogeit in the region of outer cortical cells. Phellogen produces phellem or cork towards outerside. Phellem is consisted of dead and compactly arranged cells which contains suberized cell walls while towards innerside phellogen produces secondary cortex or phelloderm which contains collenchymatous or parenchymatous cells. The phellem, phellogen and phelloderm are collectively called as Periderm. It protects internal tissues and prevents water loss.
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